I made a program that allows users to input in a cell B6 to E6, B7 to E7, B8 to E8. I want to catch non numeric characters and empty input. It will pop-up an error message and will not allow users to input in other cells.
For example the users input numbers in B6, C6, D6 but in E6, he encoded non-numeric character, excel will pop up an error and he can't encode in other input cells as long as he didn't correct the input.
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